#include "muduo/proto/codec.h"
#include "muduo/proto/dispatcher.h"
#include "request.pb.h"

#include "muduo/base/Logging.h"
#include "muduo/base/Mutex.h"
#include "muduo/net/EventLoop.h"
#include "muduo/net/TcpServer.h"

#include <iostream>
#include <unordered_map>

class Server{
public:
    typedef std::shared_ptr<dyn::TranslateRequest> TranslateRequestPtr;
    typedef std::shared_ptr<dyn::AddRequest> AddRequestPtr;

    Server(int port): _server(&_baseloop, muduo::net::InetAddress("0.0.0.0", port),
                            "Server", muduo::net::TcpServer::kReusePort),
                            _dispatcher(std::bind(&Server::onUnknownMessage, this, std::placeholders::_1, 
                                std::placeholders::_2, std::placeholders::_3)),
                            _codec(std::bind(&ProtobufDispatcher::onProtobufMessage, &_dispatcher,
                                std::placeholders::_1, std::placeholders::_2, std::placeholders::_3)){
        //注册业务请求处理函数
        _dispatcher.registerMessageCallback<dyn::TranslateRequest>(std::bind(&Server::onTranslate, this,
                                        std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));
        _dispatcher.registerMessageCallback<dyn::AddRequest>(std::bind(&Server::onAdd, this,
                                        std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));
        _server.setMessageCallback(std::bind(&ProtobufCodec::onMessage, &_codec,
                                std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));
        _server.setConnectionCallback(std::bind(&Server::onConnection, this, std::placeholders::_1));
    }

    void start(){
        _server.start();
        _baseloop.loop();
    }

private:
    std::string translate(const std::string &str){
        static std::unordered_map<std::string, std::string> dict_map = {
            {"hello", "你好"},
            {"Hello", "你好"},
            {"你好", "Hello"},
            {"吃了吗", "胡辣汤"}
        };
        auto it = dict_map.find(str);
        if (it == dict_map.end()){
            return "没听懂！！";
        }
        return it->second;
    }
    void onTranslate(const muduo::net::TcpConnectionPtr& conn, const TranslateRequestPtr& message, muduo::Timestamp){
        //1. 提取message中的有效消息， 也就是需要翻译的内容
        std::string req_msg = message->msg();
        //2. 进行翻译，得到结果
        std::string rsp_msg = translate(req_msg);
        //3. 组织protobuf响应
        dyn::TranslateResponse resp;
        resp.set_msg(rsp_msg);
        //4. 发送响应
        _codec.send(conn, resp);
    }
    void onAdd(const muduo::net::TcpConnectionPtr& conn, const AddRequestPtr& message, muduo::Timestamp){
        int num1 = message->num1();
        int num2 = message->num2();
        int result = num1 + num2;
        dyn::AddResponse resp;
        resp.set_result(result);
        _codec.send(conn, resp);
    }

    void onUnknownMessage(const muduo::net::TcpConnectionPtr& conn, const MessagePtr& message, muduo::Timestamp){
        LOG_INFO << "onUnknownMessage: " << message->GetTypeName();
        conn->shutdown();
    }
    void onConnection(const muduo::net::TcpConnectionPtr &conn){
        if (conn->connected()){
            LOG_INFO << "新连接建立成功！";
        }else{
            LOG_INFO << "连接关闭！";
        }
    }
private:
    muduo::net::EventLoop _baseloop;
    muduo::net::TcpServer _server;//服务器对象
    ProtobufDispatcher _dispatcher;//请求分发器对象--要向其中注册请求处理函数
    ProtobufCodec _codec;//protobuf协议处理器--针对收到的请求数据进行protobuf协议处理
};

int main(){
    Server server(8085);
    server.start();
    return 0;
}